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I am learning Blender and following some Udemy courses. I added some materials to the model and in the render viewport, it looks completely fine in that nothing looks broken. enter image description here

When I add a camera to the scene and try take a render image, it's almost like the materials are missing and it comes out all spotted and checkered looking. enter image description here

Does anyone have an idea what might be causing that to happen?

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    $\begingroup$ Hello :). These look like overlapping faces. Perhaps you have another (same) mesh only visible in renders. $\endgroup$
    – jachym michal
    Commented Oct 3, 2020 at 14:49
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    $\begingroup$ Oh goodness, I hate being beginner at things lol, that was exactly it, I didn't even think of that. I had a backup model disabled in the viewport but not in the render. Thank you @JachymMichal $\endgroup$
    – mindsurfer_BS
    Commented Oct 3, 2020 at 14:55
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    $\begingroup$ Happens all the time :). Glad you made it work. $\endgroup$
    – jachym michal
    Commented Oct 3, 2020 at 14:55

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What @Jachym Michal said is correct. Press ALT H in the viewport, your second object should appear, otherwise search in the outliner.
Btw. this irregular pattern of triangles and weird stripes is called z-fighting, where z is the distance to the camera, it means 2 faces occupy the same space and the camera has troubles deciding which one to show in each sample.

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